[runtime] Unify and fix the strict equality comparison.

src/x64/code-stubs-x64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 1745 matching lines @@
     __ ret(0);
   }
   __ bind(&runtime_call);
 
   // Push arguments below the return address to prepare jump to builtin.
   __ PopReturnAddressTo(rcx);
   __ Push(rdx);
   __ Push(rax);
 
   // Figure out which native to call and setup the arguments.
-  Builtins::JavaScript builtin;
-  if (cc == equal) {
-    builtin = strict() ? Builtins::STRICT_EQUALS : Builtins::EQUALS;
+  if (cc == equal && strict()) {
+    __ PushReturnAddressFrom(rcx);
+    __ TailCallRuntime(Runtime::kStrictEquals, 2, 1);
   } else {
-    builtin =
-        is_strong(strength()) ? Builtins::COMPARE_STRONG : Builtins::COMPARE;
-    __ Push(Smi::FromInt(NegativeComparisonResult(cc)));
+    Builtins::JavaScript builtin;
+    if (cc == equal) {
+      builtin = Builtins::EQUALS;
+    } else {
+      builtin =
+          is_strong(strength()) ? Builtins::COMPARE_STRONG : Builtins::COMPARE;
+      __ Push(Smi::FromInt(NegativeComparisonResult(cc)));
+    }
+
+    __ PushReturnAddressFrom(rcx);
+
+    // Call the native; it returns -1 (less), 0 (equal), or 1 (greater)
+    // tagged as a small integer.
+    __ InvokeBuiltin(builtin, JUMP_FUNCTION);
   }
 
-  __ PushReturnAddressFrom(rcx);
-
-  // Call the native; it returns -1 (less), 0 (equal), or 1 (greater)
-  // tagged as a small integer.
-  __ InvokeBuiltin(builtin, JUMP_FUNCTION);
-
   __ bind(&miss);
   GenerateMiss(masm);
 }
 
 
 static void CallStubInRecordCallTarget(MacroAssembler* masm, CodeStub* stub,
                                        bool is_super) {
   // rax : number of arguments to the construct function
   // rbx : feedback vector
   // rcx : original constructor (for IsSuperConstructorCall)
@@ skipping 3792 matching lines @@
                            kStackSpace, nullptr, return_value_operand, NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64